Network preferences keep resetting, cannot change or update

This has been fixed, but I couldn't find where someone else had a similar problem, so I thought I would describe the problem and how I got around him.

The problem is after the installation of El Capitan (upgrade from Mavericks), upgrade wiped out my network configuration. It took me a while to realize that he had activated my WiFi and erased my wired ethernet config. When I went into system-> Network Preferences and tried to enter values, I couldn't enter anything, because he would have reset my entries or interrupt me with a dialog box until I can finish. I couldn't change any settings, even the manual settings.

The cause of this problem is that, my Mac Pro for a reason, not connecting not reliable to my gigabit switch Gigabit speed. My other computers do, but not the Mac Pro. The easy solution is to manually configure the adapter to use 100 Mbps and it then connects reliably. (I tried different cables, etc..) El Capitan wouldn't let me configure the adapter for 100 Mbps. He kept just reset the config on auto.

After reboot and around hunting for preference files to remove, I diverted the ethernet connection to my 100 Mbps router, so the adapter would choose 100 Mbps. Once I did that network preferences has allowed me to enter an IP address, subnet mask, router, DNS, etc., while I couldn't before. I went to the hardware configuration and selected manual config/100Mbps on the adapter. He may also have worked just to unplug the cable and configure the adapter when you are not connected. It seems that the system continuously tries to connect to 1000Mbps and reset, which resets the pane preferences constantly, not to let whatever it is automatically registered.

As far as I am concerned, this is a bug. I have not encountered this before El Capitan. However, it is unlikely that Apple will resolve this anytime soon, because it requires you to have some sort of marginal hardware configuration that causes the adapter to think he can connect to 1000Mbps and then immediately fail to do.

This has been resolved.

Tags: Mac OS & System Software

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